Can someone explain why Bosses, and particular mobs, become immune to debuffs at certain times? For instance, demon wall during his second set of floor AoE, lasting until not too long after repel, and the last boss starting a couple seconds before first catastrophe lasting until after its cast... I cant put anything up on them. I had to deal with it a lot during Coil T2 as well. I cant find whats going on anywhere.